Hmm. "authorising copyright infringement" - that's not a concept that exists, especially when we're talking about links. Perhaps you mean "aiding" or "facilitating"?
Apparently it does exist, although it's not well-defined under UK law:
"Iain Connor, who works for Pinsent Masons, the law firm behind OUT-LAW, said that provisions within the UK's Extradition Act would give the legal means for suspected criminals to be summoned to the US.
The UK-US extradition treaty agreement allows either country to surrender a criminal suspect to the other if the crime carries a minimum punishment of a year's prison sentence.
"US companies are likely to try and secure a conviction in the US where they know that they could succeed on the basis of an offence of 'authorising copyright infringement' which in the UK is not a well defined offence," Connor said."
